The sensor uses 2.4G Wifi to communicate with the server for data. Wall mounted, easier and convenient to install. If the water sensor detects leaking water overrun,the detector alarm will sound and alert you to the situation, preventing potential water damage. When the detector was immersed by the water, the alert notifications will be pushed to your phone in time, reduce flooding risk. Whether you are in the office or on the road, you can check the status via app at any time. Widely use for washer bathrooms, basements, sinks, water heaters, aquariums dishwashers, refrigerators, fish Tanks, plumbing, toilets, behind toilet, water filtration units, garbage disposals and sump pumps etc. Specification: Material:ABS Plastic Color: White Size:71/64/23mm Probe: Water Sensor Installation: Wall Mounted Working temperature -10 to +40 Celsius Storage temperature -20 to +60 Celsius Relative humidity 8%-80% Package Includes: 1 Piece Water Alarm Sensor 1 Piece Instruction Book Note: Please allow slight dimension difference due to different manual measurement.